Question

Suppose that at room temperature, a certain aluminum bar is 1.0000 m long. The bar gets longer when its temperature is raised. The length l of the bar obeys the following relation: l = 1.0000+2.4*10^-5T, where T is the number of degrees Celsius above room temperature. What is the change of the bar's length if the temperature is raised to 17.8 Celsius above room temperature?